hw/intc/arm_gic: honor target mask in gic_update()

Take IRQ target mask into account when determining the highest priority
pending interrupt.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Acked-by: Christoffer Dall <christoffer.dall@linaro.org>
Message-id: 1407947471-26981-1-git-send-email-serge.fdrv@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/intc/arm_gic.c

@@ -66,7 +66,8 @@ void gic_update(GICState *s)
         best_prio = 0x100;
         best_irq = 1023;
         for (irq = 0; irq < s->num_irq; irq++) {
-            if (GIC_TEST_ENABLED(irq, cm) && gic_test_pending(s, irq, cm)) {
+            if (GIC_TEST_ENABLED(irq, cm) && gic_test_pending(s, irq, cm) &&
+                (irq < GIC_INTERNAL || GIC_TARGET(irq) & cm)) {
                 if (GIC_GET_PRIORITY(irq, cpu) < best_prio) {
                     best_prio = GIC_GET_PRIORITY(irq, cpu);
                     best_irq = irq;